A Symptoms - Heated Glass Element

SYMPTOMS - HEATED GLASS ELEMENT

IMPORTANT: Review the automatic day-night mirror system description and operation in order to familiarize yourself with the system functions. Refer to Automatic Day-Night Mirror Description and Operation.

The following steps must be completed before using the symptom tables.
1. Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true:
- There are no DTCs set.
- The control module(s) can communicate via GMLAN serial data. Testing and Inspection
2. Review the rear window defogger system description and operation in order to familiarize yourself with the system functions. Refer to Rear Window Defogger Description and Operation.

Visual/Physical Inspection
- Inspect for aftermarket devices which could affect the operation of the rear window defogger or the automatic day-night feature of the inside rearview mirror.
- Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
- Defogger Inoperative - Rear Window
- Defogger Grid Lines Diagnosis
- Mirrors - Automatic Day-Night Inoperative
- Mirrors - Compass Display Inoperative or Inaccurate